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1.
Noun: Something insidious, evil, and/or devious designed to rip apart humanity and destroy everything we hold dear while at the same time leaving no opportunity for repair.

Can be used as an insult or compliment/observation.
Insult:

Martha: wow i really hate her.
Theresa: she's just devil spawn.
Martha: i know, right?

Compliment:

Joe: these cookies r freakin delicious!
Not Joe: theyire devil spawn, yo!
by devilspawn2 November 16, 2009